Customs checkpoints will have to be set up in Holyhead ahead of Britain leaving the EU, First Minister Carwyn Jones has said.

While there are currently ad hoc checks on lorries and vehicles coming through the port from Ireland and other EU countries, they are not a permanent feature. But once Brexit happens and Britain quits the European Union, there will need to be customs officials there on a permanent basis.

However, Mr Jones, speaking exclusively to the Daily Post, said anything further - such introducing full border controls between the UK and Ireland, would be chaos for North Wales.

He said: “We are going to see customs back in Holyhead anyway ... but if you had passport control in Holyhead then you are going to see queues all across the island.”

Holyhead Port, Anglesey

Mr Jones said people who had supported for Brexit in the June referendum on the basis of border controls would be disappointed. He added: “The reality is a lot of people who voted for the UK to control its borders .. it’s not going to control its borders, it has a border with the Republic of Ireland - which is still in the EU - and that border is going to remain open. Controlling borders was never going to be an issue.

“It’s not quite the landslide that is being portrayed, but people have a right to express a view that they feel they’re not being listened to, the challenge then for politicians is to show they are being listened to.

We’ve got a situation where a Manhattan billionaire can appear as an advocate of the working class, or Nigel Farage, a boarding school boy who worked in the city gambling on the price of tin.

Donald Trump as he makes his acceptance speech in New York following his victory to become he 45th president of the United States (Image: Paco Anselmi/PA Wire)

“The worry for me is that we have seen Europe descend into intolerant nationalist rivalry between countries, and we know where that leads. Look at the 1930s. We have to be careful that people’s legitimate annoyances with the political system doesn’t turn us towards a nationalism that leads us in a direction we don’t want to go in.

“The problem is we have got Brexit, but the people who were the Brexiteers have gone, those of us who are still here have to work out what to do next. People have told us they want to leave the EU, that’s not under debate any more. There are no ‘Leavers’ or ‘Remainers’ any more. That question has been answered.”

Mr Jones comments came as it emerged that a number of pro-European MPs in Westminster comprising of some Labour, Liberal Democrat and SDLP members, were planning to vote against triggering Article 50, the mechanism by which Britain will begin its exit from the EU.

Tim Farron, the leader of the Lib Dems, has called for a referendum on the terms of any deal the government can negotiate with the EU before Brexit could take place.

Brexit Minister David Jones has said that the vote will go ahead and that “only the Conservatives can be trusted to respect the outcome of the referendum and make a success of Brexit”.